package com.lagou.service;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;

/**
 * Description: RpcEncoder.
 *
 * @author Wengy
 * @since JDK 1.8
 * @since 1.0.0
 */
public class RpcEncoder extends MessageToByteEncoder {
    
    private Class<?> clazz;
    
    private Serializer serializer;
    
    
    
    public RpcEncoder(Class<?> clazz, Serializer serializer) {
        this.clazz = clazz;
        this.serializer = serializer;
    }
    
    
    
    @Override
    protected void encode(ChannelHandlerContext channelHandlerContext, Object msg, ByteBuf byteBuf) throws Exception {
        
        if (clazz != null && clazz.isInstance(msg)) {
            byte[] bytes = serializer.serialize(msg);
            byteBuf.writeInt(bytes.length);
            byteBuf.writeBytes(bytes);
        }
        
    }
    
}